Evaporative cooler



FIG. 1 is a top plan view of an evaporative cooler, showing our new design;

FIG. 2 is a right side elevational view, the side opposite being identical;

FIG. 3 is a front elevational view, the rear being identical;

FIG. 4 is a bottom plan view thereof; and

FIG. 5 is a bottom perspective view thereof. 

The ornamental design for an evaporative cooler, substantially as shown and described. 